In the common ancestor of protostomes and deuterostomes, the pattern of early cleavage was

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The common ancestor of protostomes and deuterostomes had a pattern of early cleavage which was radial. This means that the cells divide symmetrically around a central axis, producing daughter cells that are similar in size and position to each other. This is in contrast to spiral cleavage, which produces cells that are offset from each other and leads to an asymmetrical pattern of cell divisions.

In the Common Ancestor of Protostomes and Deuterostomes, the Pattern